Thank you for visiting RF Cafe! Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs Twitter LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Calculators Education Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings RF Cafe Archives Test Notes Wireless System Designer RF Stencils for Visio Shapes for Word Search RF Cafe Sitemap Advertising Facebook RF Cafe Homepage Thank you for visiting RF Cafe!

First American Made Quartz Watch
March 1972 Popular Electronics

March 1972 Popular Electronics

March 1972 Popular Electronics Cover - RF Cafe  Table of Contents

Wax nostalgic about and learn from the history of early electronics. See articles from Popular Electronics, published October 1954 - April 1985. All copyrights are hereby acknowledged.

Bulova Accuquartz (http://foro.sincortenohaygloria.com) - RF CafeThis Bulova Accuquartz wristwatch is not the first quartz-controlled wearable timepiece; however, it was the first to be manufactured in the U.S. Interestingly, it is not a fully electronic watch because the quartz crystal stimulates a mechanical tuning fork which ultimately drives the hands. Bulova's first tuning-fork-driven "Accutron" was introduced in 1960. It sported a 360 Hz tuning fork that was stimulated by a pair of electromagnets.

I found a couple nice photos of the Accuquartz on the foro.sincortenohaygloria.com website if you want some close-up views.

First American Made Quartz Watch

First American Made Quartz Watch, March 1972 Popular Electronics - RF Cafe

Watch at right is Bulova's Accuquartz while one at left is earlier, bulky Swiss-made model selling for $1000.

An advanced quartz crystal wristwatch has been introduced by Bulova into a limited number of Manhattan jewelers at a retail price of $395. This is the first such watch to be miniaturized to traditional wristwatch size and the first to be completely manufactured in the U.S.

The crystal is a subminiature sealed type that oscillates at 32,768 Hz, which is two to four times as great as the crystal frequency in other quartz watches now on the market. The actual frequency of the crystal is divided down by IC circuitry to 341 1/3 Hz to drive a tuning fork. The fork, in turn, drives the hands of the watch as well as the day and date indicators.

The IC used is a single plastic-encapsulated low-threshold CMOS (Complementary Metal Oxide Semiconductor) manufactured to Bulova specs by Intersil, of Cupertino, California.

Energy to power the watch is provided by an aspirin-size power cell, which lasts for about 1 year and must be changed by a jeweler. As for accuracy, the watch can be expected to gain or lose no more than 1 to 2 seconds per week when worn on the wrist.

 

 

 

Posted October 16, 2017

RF Cafe Software

   Wireless System Designer - RF Cafe
Wireless System Designer

RF & EE Symbols Word
RF Stencils for Visio
Calculator Workbook
RF Workbench
Smith Chartâ„¢ for Visio
Smith Chartâ„¢ for Excel

About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2022
Webmaster:
Kirt Blattenberger,
 BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:
 AirplanesAndRockets.com

Try Using SEARCH
to Find What You Need. 
There are 1,000s of Pages Indexed on RF Cafe !

height-line